It seems to me that the words "sexism" and "racism" are perceived differently by society.

Compared to "racism", "sexism" is more often understood as "institutional sexism" rather than "personal prejudice against a different gender".

The statement "[some country] is sexist" is usually less controversial than "[some country] is racist", as the former gets more interpreted as "women have it worse in [some country]" but the latter as "people in [some country] are prejudiced towards other races".

Why "instead of their job"? It's perfectly possible to both do your job and engage in activism.

My impression is that tech is one area where union membership is very low in Germany.

Ideally we would rebalance between those from poor families and those from rich and educated ones. Oppression exists in different forms and there are also poor squirrels.